Added catalan translation for "Europe" that was missing because at that time it wasn't present in the original English language file that had been used as base (has been fixed in b2b163138237ff5d18bd38448f112ddb84dd0e53).
Catalan translation: Added translation for string "irc_channel_description" newly introduced in commit b3330c6a1bb0508ef930ea392de0a72be9ca4048
Catalan translation: Minor improvements, mostly spelling errors